Subtract 12/8 from 20/30
1st number: 20/30, 2nd number: 1 4/8
20/30 - 12/8 is -5/6.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 8 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 30 × 4 = 120,
20/30 = 20 × 4/30 × 4 = 80/120 - Likewise, for the 2nd fraction, since 8 × 15 = 120,
12/8 = 12 × 15/8 × 15 = 180/120 - Subtract the two like fractions:
80/120 - 180/120 = 80 - 180/120 = -100/120 - After reducing the fraction, the answer is -5/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/30-12/8 20/30-24/8 20/60-12/8 20/30-12/16 60/30-12/8 20/30-36/8 20/90-12/8 20/30-12/24 20/30-60/8 20/30-12/40 20/30-84/8 20/30-12/56